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GPT-5.1-Codex vs MiniMax M2.1

GPT-5.1-Codex leads MiniMax M2.1 on the Artificial Analysis Intelligence Index, 23.7 to 20.9, and MiniMax M2.1 costs 8.3x less per output token ($1.20 vs $10.00 per million). Updated October 22, 2026; 19 benchmarks have a result for both.

Replace GPT-5.1-Codex Replace MiniMax M2.1
GPT-5.1-CodexOpenAI
Coding
15.3
Overall
No data
Output $/M
$10.00
15
MiniMax M2.1MiniMax
Coding
No data
Overall
No data
Output $/M
$1.20
4
vs boards won of 19 shared

GPT-5.1-Codex or MiniMax M2.1: which to pick

Only GPT-5.1-Codex has a coding score, 15.3 on the Vibe Coding Index; MiniMax M2.1 has none, so the two cannot be ranked on coding.

Pick MiniMax M2.1 for output tokens 8.3x cheaper ($1.20 vs $10.00 per million) and a lower cost per solved task ($0.59 against $0.892).

Model AGPT-5.1-CodexOpenAI15.3/1002 independent benchmarks$0.892 per solved taskModel BMiniMax M2.1MiniMaxNot benchmarked1 independent benchmark$0.59 per solved task
Shared results
19
GPT-5.1-Codex only
7
MiniMax M2.1 only
15
Like-for-like categories
8 of 9

Only benchmarks that tested both models count toward a pick; a result only one model has is shown but not compared.

Which one for your work

Each card is decided by one number both models carry. Where only one has it, the card says so and makes no call.

At a glance

Coding index
GPT-5.1-Codex 15.3 from 2 benchmarks, MiniMax M2.1 not benchmarked.
Widest category
Math, 13.0 points apart on average over 2 shared benchmarks.
Widest single gap
Terminal-Bench: GPT-5.1-Codex 57.8% against MiniMax M2.1 36.6%, 21.2 points apart on a 0 to 100 scale.
Output price
GPT-5.1-Codex $10.00 against MiniMax M2.1 $1.20 per million output tokens, 8.3x apart.
Context window
GPT-5.1-Codex takes 400K tokens, MiniMax M2.1 205K.

Benchmark by benchmark

First the score: boards each model leads, per category, where both have a result. Then every board, a category to a fold; bars are each result on a 0 to 100 scale, so compare the two in a row, not one row with another.

Boards won, where both have a result
CategoryGPT-5.1-CodexBarsMiniMax M2.1Ties
Coding50
Intelligence10
Agentic work01
Reasoning20
Math20
Knowledge01
Web design32
General20
All shared boards154
CodingLike-for-likeSix of these boards feed the Vibe Coding Index50
Coding benchmarks for GPT-5.1-Codex and MiniMax M2.1
BenchmarkGPT-5.1-CodexMiniMax M2.1Leader
SWE-bench Verified66.0%Not measuredOnly GPT-5.1-Codex measured
LMArena WebDev1337Not measuredOnly GPT-5.1-Codex measured
LiveCodeBench (Vals AI)85.5%81.8%GPT-5.1-Codex
SWE-bench Verified (Vals AI)Not measured74.8%Only MiniMax M2.1 measured
Vibe Code Bench (Vals AI)13.1%Not measuredOnly GPT-5.1-Codex measured
LiveCodeBench (Artificial Analysis run)84.9%81.0%GPT-5.1-Codex
Terminal-Bench Hard (Artificial Analysis run)34.8%28.8%GPT-5.1-Codex
Terminal-Bench57.8%36.6%GPT-5.1-Codex
ALE-Bench1244.9623.8GPT-5.1-Codex
LMArena WebDev: HTML1346Not measuredOnly GPT-5.1-Codex measured
Neither model has a result on the other 29 boards here
IntelligenceLike-for-likePublic boards, shown as published, kept out of the index10
Intelligence benchmarks for GPT-5.1-Codex and MiniMax M2.1
BenchmarkGPT-5.1-CodexMiniMax M2.1Leader
AA Intelligence Index23.720.9GPT-5.1-Codex
Neither model has a result on the other 1 board here
Agentic workLike-for-likePublic boards, shown as published, kept out of the index01
Agentic work benchmarks for GPT-5.1-Codex and MiniMax M2.1
BenchmarkGPT-5.1-CodexMiniMax M2.1Leader
Design Arena: agents building web apps1018Not measuredOnly GPT-5.1-Codex measured
Design Arena: agents building full-stack apps1086Not measuredOnly GPT-5.1-Codex measured
Design Arena: agents building mobile apps1191Not measuredOnly GPT-5.1-Codex measured
τ²-Bench Telecom83.0%85.4%MiniMax M2.1
Neither model has a result on the other 37 boards here
ReasoningLike-for-likePublic boards, shown as published, kept out of the index20
Reasoning benchmarks for GPT-5.1-Codex and MiniMax M2.1
BenchmarkGPT-5.1-CodexMiniMax M2.1Leader
GPQA DiamondNot measured78.5%Only MiniMax M2.1 measured
GPQA Diamond (Artificial Analysis run)86.0%83.0%GPT-5.1-Codex
Humanity's Last Exam (Artificial Analysis run)25.7%23.2%GPT-5.1-Codex
Neither model has a result on the other 19 boards here
MathLike-for-likePublic boards, shown as published, kept out of the index20
Math benchmarks for GPT-5.1-Codex and MiniMax M2.1
BenchmarkGPT-5.1-CodexMiniMax M2.1Leader
AIMENot measured77.9%Only MiniMax M2.1 measured
MATH 500 (Vals AI)Not measured89.0%Only MiniMax M2.1 measured
MGSM (Vals AI)Not measured87.8%Only MiniMax M2.1 measured
AA Math Index95.782.7GPT-5.1-Codex
AIME 2025 (Artificial Analysis run)95.7%82.7%GPT-5.1-Codex
Neither model has a result on the other 8 boards here
KnowledgeLike-for-likePublic boards, shown as published, kept out of the index01
Knowledge benchmarks for GPT-5.1-Codex and MiniMax M2.1
BenchmarkGPT-5.1-CodexMiniMax M2.1Leader
MMLU ProNot measured87.0%Only MiniMax M2.1 measured
LegalBench (Vals AI)Not measured75.5%Only MiniMax M2.1 measured
CaseLaw (Vals AI)Not measured55.8%Only MiniMax M2.1 measured
CorpFin (Vals AI)Not measured58.9%Only MiniMax M2.1 measured
TaxEval (Vals AI)Not measured66.3%Only MiniMax M2.1 measured
MedQA (Vals AI)Not measured91.2%Only MiniMax M2.1 measured
MedCode (Vals AI)Not measured34.1%Only MiniMax M2.1 measured
MMLU Pro (Artificial Analysis run)86.0%87.5%MiniMax M2.1
Neither model has a result on the other 10 boards here
Web designLike-for-likePublic boards, shown as published, kept out of the index32
Web design benchmarks for GPT-5.1-Codex and MiniMax M2.1
BenchmarkGPT-5.1-CodexMiniMax M2.1Leader
Design Arena: websites11611201MiniMax M2.1
Design Arena: UI components12341220GPT-5.1-Codex
Design Arena: game dev11371134GPT-5.1-Codex
Design Arena: data viz12131206GPT-5.1-Codex
Design Arena: 3DNot measured1164Only MiniMax M2.1 measured
Design Arena: all code categories11521190MiniMax M2.1
Design Arena: SVGNot measured1131Only MiniMax M2.1 measured
Neither model has a result on the other 2 boards here
GeneralLike-for-likePublic boards, shown as published, kept out of the index20
General benchmarks for GPT-5.1-Codex and MiniMax M2.1
BenchmarkGPT-5.1-CodexMiniMax M2.1Leader
MedScribe (Vals AI)Not measured80.8%Only MiniMax M2.1 measured
IFBench70.0%69.9%GPT-5.1-Codex
Long context reasoning (AA-LCR)69.3%67.7%GPT-5.1-Codex
Neither model has a result on the other 43 boards here
Image generationNot comparablePublic boards, shown as published, kept out of the index0 boards, none shared
Image generation benchmarks for GPT-5.1-Codex and MiniMax M2.1
BenchmarkGPT-5.1-CodexMiniMax M2.1Leader
Neither model has a result on 5 boards here

What each workload costs

Three fixed token mixes at each model's listed price, so per-token rates become a bill.

Chat turn

1K input + 500 output tokens

GPT-5.1-Codex$0.0063Fits in one request
MiniMax M2.1$0.0009Fits in one request

MiniMax M2.1 costs less

Repository review

50K input + 3K output tokens

GPT-5.1-Codex$0.092Fits in one request
MiniMax M2.1$0.019Fits in one request

MiniMax M2.1 costs less

Agent loop

200K input + 10K output tokens

GPT-5.1-Codex$0.350Fits in one request
MiniMax M2.1$0.072Exceeds the context window

MiniMax M2.1 costs less

Listed OpenRouter rates, without cache or batch discounts. A workload that does not fit a model's context window would need splitting.

Specification differences

The leading value in a row is marked; a row with a missing value names no leader. Our two rows are marked in red.

Specifications of GPT-5.1-Codex and MiniMax M2.1
SpecificationOpenAI GPT-5.1-CodexMiniMax M2.1
MakerOpenAIMiniMax
WeightsNo public weights listedOpen weights
ReleasedNovember 13, 2025December 23, 2025
Context window400K205K
Input $/Mtok$1.25$0.30
Output $/Mtok$10.00$1.20
Coding index15.3Not benchmarked
Independent measurements behind it21
Cost per solved task$0.892$0.59
SourceOpenRouter listingOpenRouter listing

Questions

Is GPT-5.1-Codex better than MiniMax M2.1 for coding?

Only GPT-5.1-Codex has a coding score, 15.3 on the Vibe Coding Index; MiniMax M2.1 has none, so the two cannot be ranked on coding. Pick MiniMax M2.1 for output tokens 8.3x cheaper ($1.20 vs $10.00 per million) and a lower cost per solved task ($0.59 against $0.892).

Which is cheaper, GPT-5.1-Codex or MiniMax M2.1?

GPT-5.1-Codex costs $1.25 per million input tokens and $10.00 per million output tokens; MiniMax M2.1 costs $0.30 and $1.20. Per solved SWE-bench Verified task, GPT-5.1-Codex costs $0.892 and MiniMax M2.1 $0.59.

Which has the bigger context window, GPT-5.1-Codex or MiniMax M2.1?

GPT-5.1-Codex, with 400K tokens against 205K.

How many benchmarks is the GPT-5.1-Codex vs MiniMax M2.1 comparison based on?

19 benchmarks have a result for both models as of October 22, 2026. GPT-5.1-Codex's coding index rests on 2 independent benchmarks and MiniMax M2.1's on 1. Where only one model has a result, the page says so instead of naming a winner.

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